He actually published a follow-up today discussing his thoughts on whether he might be asexual or aromantic: https://lukasrosenstock.net/2023/04/12/the-word-asexual.html

I found it quite telling that he seems sure he's not aromantic because of experiencing romantic love, but is not sure whether he's asexual. That seems to me like a strong signal that he is asexual, or at least much closer to it than most people.